The car originally produced over 600 horsepower (448 kW) from a 1759 cc twin-turbocharged engine. This engine, christened Triflux, was built in an unusual fashion; the valves were crossed (for each side of the cylinder there was an intake and an exhaust valve), so that the two turbochargers could be fed with two separate manifolds. A single manifold carried the intake air (hence the name, from the three separate air ducts). However, Group S rules would have artificially limited the car's output to 300 hp (224 kW) to limit speeds.

The car made extensive use of the composite materials Kevlar and carbon fibre to save weight and add strength. Overall the car weighed 930 kg (2,050 lb).

The car featured a new Martini colour-scheme, replacing the S4's white bodywork with red-based scheme. Lancia used the new scheme on its competition cars in 1987.

The Restored ECV1, rebuilt from the original parts, was displayed at the Rally-Legend Event on 7-8-9 October 2010 in San-Marino, by the owner, Giuseppe Volta. An original TriFlux engine has been re-prepared, with the help of the original designer, Ing. Claudio Lombardi, and modern Turbo-engine preparation expert, Claudio Berri.[1] A website has been opened to note the occasion.[2]

Despite the cancellation of Group S, Lancia improved the ECV with the ECV II. The ECV II carbon-fibre chassis was that of the ECVI. The designer of the car is Carlo Gaino of Synthesis design [1]. The ECV II concept car was more compact and featured improved aerodynamics. The ECV II had the same engine and chassis but a different paint scheme.